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Finding the Fourth Proportional to 57.44, 85.75 and 49.80

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Solution

The fourth proportional to 57.44, 85.75 and 49.80 is: 74.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.44 : 85.75 = 49.80 : x
  2. Step 2: Convert to fraction form
    57.44/85.75 = 49.80/x
  3. Step 3: Cross multiply
    57.44x = 85.75 × 49.80
  4. Step 4: Simplify right side
    57.44x = 4,270.35
  5. Step 5: Solve for x
    x = 4,270.35/57.44
  6. Step 6: Final answer
    x = 74.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.